radiolaria - rads_cat - Cryptogyrus radiolaria - rads_cat - Cryptogyrus


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Cryptogyrus trachylobus Sugiyama 1993
= Cryptogyrus trachylobus


Citation: Cryptogyrus Sugiyama 1993
taxonomic rank: genus
Type species: Cryptogyrus trachylobus Sugiyama 1993
Described on page(s) : 65
Family (traditional): Plagiacanthidae
Family (modern): Lophophaenidae

Current identification/main database link: Cryptogyrus Sugiyama 1993

Original Description

Diagnosis.一Test consisting of exclusively large eucephalis, with or without loosely defined ante- and postcephalic lattice shell, and having a distinct ring structure in the skeleton. PR is thick, circular in cross section. DR is composed of four arches which are convex upward and forms the lower margin of a large eucephalic chamber. Y/X is much larger than 1 . A is short, usually not forming external prolongation. A' absent. D and two L relatively thin. D' and L' may be distinct, l' and V' missing. Two l" and V" are short. When one views from the basal side, two l" always lie in a plane perpendicular to the sagittal plane. V is commonly present, but rarely absent as an intraspecific variation. In the latter cases, PR and DR are connected by five bars consisting of A, two l" and two pillars developed on the ventral side (Figure 19-4b). There are no additional connector bars between PR and additional lattice wall.
Remarks. - This genus differs from Botryopera in lacking A', two l' and V' and having only four connector bars between PR and DR in typical specimens. Further remarks are given in the discussion of the type species.

From the oreek cryptos, hid­den, and gyros, circle; masculine gender.


Sugiyama, K. (1993). Skeletal structures of Lower and Middle Miocene Lophophaenids (Radiolaria) from central Japan. Transactions and Proceedings of the Palaeontological Society of Japan. 169: 44-72. gs


Cryptogyrus compiled by the radiolaria@mikrotax project team viewed: 18-7-2024

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